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From: Paul Brook <paul@codesourcery.com>
Subject: Re: [Qemu-devel] Absolute Mouse in VNC and debug ports patch
Date: Sat, 3 Apr 2010 16:26:52 +0100
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To: qemu-devel@nongnu.org
Cc: Gerhard Wiesinger <lists@wiesinger.com>

> This is my first contribution to QEMU: I've written a virtual piece of
> hardware (e.g. ports) that the mouse pointer can be used as an absolute
> pointing device even with non USB devices, e.g. with DOS and doesn't need
> any high memory usage USB driver. This is necessary for e.g. VNC remote
> access, this was my primary motivation.

Why not just use the existing vmmouse?

> To use it you need a mouse driver (e.g. cutemouse,
> http://cutemouse.sourceforge.net/) and an QEMU mouse TSR.
> Further the mouse TSR emulates also a HP-HIL 45911 tablet digitizer. This
> device has been chosen because an Interrupt interface exists at INT 6Fh and
> therefore it is relativly easy to emulate (all other devices I've evaluated
>  use the serial port and are therefore much more complex to emulate)

However emulating an actual tablet connected to the serial port means you 
don't need any custom guest software.

>Further I've written a simple logging debug ports functionality to debug the
>driver

This looks a lot like the existing isa-debugcon.

Paul